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Bichromatic Light Source for Subcell Performance Analysis in Perovskite/Silicon Tandem Solar Cells
M. Jošt, G. Matic, E. Köhnen, B. Li, B. Glažar, M. Jankovec, S. Albrecht, M. Topic
Stability, Tandem, Perovskite
Perovskites and Other Non-Silicon Materials and Devices, Multijunctions/Tandems
Subtopic: Tandems
Event: 38th European Photovoltaic Solar Energy Conference and Exhibition
Session: 3BV.2.57
483 - 485
ISBN: 3-936338-78-7
Paper DOI: 10.4229/EUPVSEC20212021-3BV.2.57
0,00 EUR
Document(s): paper


We present a tailored bichromatic LED array setup for in-depth analysis of tandem solar cells. Two spectrally independent LED arrays are used to selectively bias the two subcells of monolithic perovskite/silicon tandem devices, which facilitates intensity calibration and improves stability of the light source. The developed bichromatic LED setup (BCLED) offers a reliable and spectrally controlled several 1000-hours long maximum power point stability test of tandem solar cells. Additionally, selective biasing of subcells enables investigation of individual subcell performance. We showcase this by successfully disentangling the tandem J-V curve into subcell J-V curves. A detailed procedure how to use BCLED to obtain parameters for one diode-model of each subell is described, with the parameters later used to reconstruct tandem and both subcell J-V curves using simulations. The procedure is validated by simulations and then employed on a high-efficiency perovskite/silicon tandem device, showing great matching with the measured J-V curve. Therefore, the BCLED setup can be used for quick subcell quality control and performance analysis as well as for long-term stability testing in maximum-power-point tracking mode with periodic I-V scans.